TT Earth and Neutral voltage.

[La Poste]

Just out of interest if a TT system is installed with a decent earth rod what sort of voltages exist between the Neutral in respect to real earth potential of 0 Volts?
What's the average Neutral to Earth voltage, does it fluctuate from time to time?
Does it get dangerous???
Thanks.

 

[spud1]

The lower the impedance of the rod to earth the less potential between it and neutral (i.e less voltage) High impedance on rod e.g 100 Ohms have seen voltages of up to 70V before (above 50V touch volatge - danger) As little as 10V for rods with with lower imp.